An award for a stack replacement design contract for two boilers that burn ultra-low sulfur diesel (ULSD) fuel to supply steam heat to the Kesselring Site approximately from September 15 through May 15 each year was provided. The award required to deliver a design that avoids high concentration impacts from boiler combustion gases at site‐wide HVAC air intakes. To accomplish this, CHANGE proposed and conducted a refined air dispersion modeling analysis using the USEPA’s AERMOD modeling system. Details on the technical approach, schedule, and deliverable are presented in the following sections of this proposal. CHANGE conducted a refined air dispersion modeling analysis using the USEPA AERMOD system to determine an acceptable exhaust stack design, such that the combustion exhaust does not negatively impact site‐wide building intakes. The AREMOD system incorporated actual spatial representation of structures, emission sources and receptors to calculate concentrations using processed meteorological data. The modeling was performed following USEPA and New York State Department of Environmental Conservatism (NYSDEC) air dispersion modeling guidelines. Predicted concentrations were compared to the design criteria discussed in the previous section and from our results were not found to be impacting the building of concern on the KAPL campus.
